North Korea Suffers Internet Outage In Wake Of Sony Hacking Attack

In this image taken from video made available on Wednesday, Jan. 1, 2014, North Korean leader Kim Jong Un delivers an annual New Year's Day message in Pyongyang, North Korea. Kim boasted Wednesday that North Korea enters the new year on a surge of strength because of the elimination of "factionalist filth" - a reference to the young leader's once powerful uncle, whose execution last month raised questions about Kim's grip on power. (AP Photo/KRT via AP Video) TV OUT, NORTH KOREA OUT

It's not immediately clear if the Internet connectivity problems were an act of retribution for a major intrusion at Sony Pictures Entertainment that the FBI last week linked to North Korea.

President Barack Obama on Friday said the U.S. government would respond but didn't say how.

The White House declined to comment Monday. State Department spokeswoman Marie Harf told reporters that of the federal government responses, "some will be seen, some may not be seen."

Doug Madory (Muh-DOOR-ee), director of Internet analysis at Dyn Research, said the Internet connectivity problems were discovered in the last 24 hours and have gotten progressively worse to the point that "North Korea's totally down."